Structure Design And Performance Test Of 4.5m Cutting Table Of Self-propelled Straw Feed Harvester

The self-propelled straw feed harvester is an agricultural machinery which can process corn,sorghum,rice and other crop straw mechanically to make it suitable for livestock consumption.Cutting table is the key component of straw feed harvester,which has an important impact on the performance of the harvester.At present,the domestic straw feed harvester cutting table is mainly small and medium-sized below 3m,while the 4m or more cutting table can not meet the domestic straw feed harvester matching requirements due to low efficiency,high energy consumption and poor stability.In order to solve the above problems,a self-propelled straw harvester with a working width of 4.5m was designed,and its simulation analysis and experimental study were carried out.The main research contents of this subject are as follows:1.Using the method of three-dimensional simulation design and experiment,the overall structure of the cutting table of self-propelled straw feed harvester was designed by three-dimensional modeling,the overall power system of the cutting table was analyzed,the folding hydraulic system was analyzed and designed,and the interlocking mode was adopted to ensure that the sub-frame after folding of the cutting table would not automatically drop to ensure the safety of the whole machine,and the key parts of the cutting table were also analyzed and designed.The parts are designed in structure.2.The structure of cutter,safety clutch,tooth-embedded clutch mechanism and divider of self-propelled straw feed harvester were simulated and analyzed by finite element three-dimensional solid simulation analysis method.Using ANSYS Workbench finite element simulation analysis software,the strain of the cutter,safety clutch and tooth-mounted clutch under load is analyzed.The results show that the maximum equivalent stress of the cutter is 348.69 MPa,which is less than 430 MPa of 65 Mn high-quality carbon steel.The structure of the cutter meets the design and production requirements.The maximum equivalent stress of the safety clutch is 45.859.MPa,less than the yield strength of ordinary carbon steel 220 MPa,the safety clutch structure meets the design and production requirements;the maximum equivalent stress of the dental-embedded clutch mechanism is 318.7 MPa,less than the yield strength 785 MPa of 40 MnB,and the structure of the dental-embedded clutch mechanism meets the design and production requirements;the kinematics simulation analysis of the divider is carried out using the kinematics module of ADAMS software,and the divider has been analyzed in operation.The analysis results show that the maximum vertical angle between corn straw and ground normal is 17 degrees,which is less than the maximum breaking angle 20 degrees,of corn straw and the structure of the divider meets the design and production requirements.3.Orthogonal test analysis method was used to test the performance of self-propelled straw feed harvester.On October 6,2018,a field production performance test was carried out in Qianrenli Village,Guye District,Tangshan City.The test results show that the uniformity of straw chopping of the self-propelled straw harvester designed by this subject is 94.26%,more than 85% of the straw feed harvester for chopping uniformity.